I have found a new project.  

The Talking Breathalyzer

 

This is a good little open source project I found on instructables.com.  Although it can not give a B.A.C. (Blood Alcohol Content) it is still a fun little party gadget to amuse all your friends.

Here is a description of the project from the build page. 

" A customizable Breathalyzer that talks and tells you how much you’ve had to drink. It’s also open source and can easily be modified with your own text on the LCD screen and audio MP3 files.

When tethered to a PC with a USB cable, it has additional features including character animations, Breathalyzer Tweets, text to speech, weather and stock read-outs, and a Photobooth feature."

   Here is the parts list for the project and the full detailed instructions at The Talking Breathalyzer

Part List

Seeeduino or Arduino - $25
Seeed Music Shield - $27.50
Seeed Twig Alcohol Sensor - $7.90
Seeed Twig Serial LCD - $13.90
Seeed Twig Cables - $4.90
2 GB MicroSD card (cards larger than 2GB will not work) - $7
Protoboard
10k Potentiometer
4 Momentary Switches
1 Off/On Switch (for power)
5 10k Resistors
1 Toggle Switch
Enclosure of your Choice
LIPO Battery - $12
LIPO Rider - $9.50
Talking Breathalyzer Software - Free
Solar Panel Optional
Speaker Amp and Speaker Optional

*** A fully assembled version of the Talking Breathalyzer is available here from Seeedstudio and additional info at http://talkingbreathalyzer.com ***